Dual clutch transmission control device

• US 8,387,479 B2
• Filed: 08/04/2009
• Issued: 03/05/2013
• Est. Priority Date: 08/04/2008
• Status: Expired due to Fees

• Current Assignee: Aishin AI Company Limited (Aisin Corp.)
• Original Assignee: Aishin AI Company Limited (Aisin Corp.)
• Inventors: Ogami, Shiro
• Primary Examiner(s): Chambers, Troy
• Assistant Examiner(s): GONZALEZ, MICHAEL P
• Application Number:
  US12/535,037
• Publication Number:
  US 20100024581A1
• Time in Patent Office: 1,309 Days
• Field of Search: 743/30, 743/31, 743/35, 743/40, 743/36.R, 477/115, 477/116, 477/120, 477/904, 477/77, 701/57, 701/64
• US Class Current: 74/336.R
• CPC Class Codes: F16H 2061/0216 Calculation or estimation of post shift values for different gear ratios, e.g. by using engine performance tables
• CPC Class Codes: F16H 59/18 dependent on the position of the accelerator pedal
• CPC Class Codes: F16H 61/0213 characterised by the method for generating shift signals
• CPC Class Codes: F16H 61/688 with two inputs, e.g. selection of one of two torque-flow paths by clutches
• CPC Class Codes: Y10T 74/1926 Speed responsive

Abstract

A dual clutch transmission includes a first and second input shaft, an output shaft, a dual clutch having a first clutch and a second clutch, a first and second gear transmission mechanisms, and a control device connected to an accelerator opening degree sensor, detecting an accelerator opening degree, and a rotational speed sensor, detecting a rotational speed of an engine, and is provided with a pre-shift control device pre-selecting the shift stage gear set for establishing the shift stage, which is one stage upper or lower than the shift stage established by the selected shift stage gear set from one of the first and second gear transmission mechanisms, when values of the accelerator opening degree, the rotational speed, and the rotation acceleration, becomes equal to or more than predetermined upper shift stage pre-shift setting values or equal to or less than predetermined lower shift stage pre-shift setting values.

Claims

1. A dual clutch transmission comprising:

a first input shaft;

a second input shaft coaxially arranged with the first input shaft;

an output shaft arranged in parallel with the first input shaft and the second input shaft;

a dual clutch having a first clutch and a second clutch transmitting rotational torque of an engine to the first input shaft and the second input shaft, respectively;

a first gear transmission mechanism arranged between the first input shaft and the output shaft, having a plurality of shift stage gear sets for establishing odd-numbered shift stages, selecting one of the plurality of shift stage gear sets for establishing the odd-numbered shift stages, and transmitting rotational torque of the first input shaft to the output shaft;

a second gear transmission mechanism arranged between the second input shaft and the output shaft, having a plurality of shift stage gear sets for establishing even-numbered shift stages, selecting one of the plurality of shift stage gear sets for establishing the even-numbered shift stages, and transmitting rotational torque of the second input shaft to the output shaft; and

a control device selecting one of the shift stage gear sets from either the first gear transmission mechanism or the second gear transmission mechanism, changing the first clutch and the second clutch of the dual clutch by disengaging the one of the first and second clutches which is in an engaged state while engaging the other of the first and second clutches which is in a disengaged state, on the basis of a command of shifting the shift stages in response to a manual operation, and transmitting the rotational torque of the engine to the output shaft by means of the selected shift stage gear set, wherein

the control device is connected to at least one of an accelerator opening degree sensor, detecting an accelerator opening degree, and a rotational speed sensor, detecting a rotational speed of the engine, and is provided with a pre-shift control device pre-selecting one of the shift stage gear sets for establishing the shift stage, which is one stage upper or one stage lower than the shift stage established by the selected shift stage gear set, from one of the first and second gear transmission mechanisms, in which the selected shift stage is not provided, when at least one of values of the accelerator opening degree, detected by means of the accelerator opening degree sensor, the rotational speed, detected by means of the rotational speed sensor, and the rotation acceleration, calculated on the basis of the rotational speed detected by the rotational speed sensor, becomes equal to or more than predetermined upper shift stage pre-shift setting values or equal to or less than predetermined lower shift stage pre-shift setting values, and when the other of the first and second clutches is in the disengaged state.

2. The dual clutch transmission according to claim 1, wherein

the control device further includes a pre-shift releasing device, and

in a state where the shift stage gear set, which the pre-shift control device pre-selects is not transmitting the rotational torque of the engine by means of the dual clutch, when at least one of the values of the accelerator opening degree, the rotational speed, and the rotation acceleration becomes equal to or less than the predetermined upper shift stage pre-shift releasing values, or equal to or more than the predetermined lower shift stage pre-shift releasing values, the pre-shift releasing device cancels the selection of the pre-shifted shift stage gear set.